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In Reply to: Why are 6sn7s noisy in one preamp and not another? posted by Trouser Trout on November 15, 2015 at 11:26:43:
Design Compromise, not just your unit:
Soundstage Review: "The noise level could be lower, but if you select an amplifier with a moderate input sensitivity, like Rogue Audio's Atlas (1V sensitivity) and avoid super-high-sensitivity speakers, noise should not be a problem."
The go-to sources are:
heater voltage too high,
too much (too little) plate current or voltage,
noisy/cheap plate load resistor,
noisy/cheap resistors,
noisy power supply,
poor mechanical layout,
poor circuit board layout,
cracks in the circuit board traces,
lead free solder problems
Cheap electrolytic capacitors
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Follow Ups
- RE: Why are 6sn7s noisy in one preamp and not another? - Chip647 17:57:10 11/15/15 (0)